The massive hole, which spans about 262 feet in diameter, was spotted recently on the Yamal Peninsula in Russia, commonly known as the “end of the world,” The Siberian Times reported. The depth of the hole is not yet known.

New video footage shows the mysterious hole surrounded by vegetation in a seemingly remote area. The ground on the outskirts of the hole appears to have been displaced, perhaps by whatever caused the hole to form.

Given the crater’s proximity to a natural gas field, one theory is that the hole formed following an explosion, caused by a mixture of gas, salt and water igniting underground.